you ca go with either. They are the same skimmer. The reducer on one might be a little different. The biggest difference is the mesh mod. MS uses zip tieswhen doing the mesh mod where R uses fishing line to do the mesh mod. I have used both I like using the line over the zip ties. he ties are easier bit create more work for the pump. just thought I would add that. I am using CNC reducer on mine. The pinwheels are slightly different. Otherwise you are getting same skimmer. Same body and pump. Kinda like buying a gmc or chevy truck...